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ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
COMPUTATION OF A LAMINAR DIFFUSION ETHYLENE/AIR FLAME CONSIDERING SOOT FORMATION AND THE WEIGHTED-SUM-OF-GRAY-GASES MODEL
Submission Author:
Luís Gustavo Pires Rodrigues , RS , Brazil
Co-Authors:
Luís Gustavo Pires Rodrigues, Francis França, Fernando Pereira, PAULO PAGOT
Presenter: Luís Gustavo Pires Rodrigues
doi://10.26678/ABCM.ENCIT2018.CIT18-0250
Abstract
In the present study the weighted-sum-of-gray-gases (WSGG) model was coupled with the commercial CFD package Ansys/Fluent to solve a laminar diffusion ethylene/air flame. Numerical data was obtained through the solution of the full transport equations considering detailed chemistry and soot formation. Mixture WSGG coefficients for constant partial pressure ratio (pw/pc = 1) were combined with coefficients for soot for 2, 3 and 4 gray gases to account the gas-phase/soot heat transfer. The coupling of the radiation model with the CFD code was made with user-defined functions (UDF) written in C programming language. Fluent standard WSGG model was also applied. The predicted radiant fraction for the Fluent WSGG model implementation was in order of 9% while the UDF implemented WSGG considering 4 gray gases for soot reached up to 13%. The radiative heat flux and radiative heat source computed with Fluent WSGG are considerably lower than the predicted with the UDF implemented WSGG.
Keywords
Radiative heat transfer, WSGG model, Computational fluid dynamics (CFD), Laminar diffusion flame, thermal radiation
